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Silver cylindrical metal tap with straight flutes and TiN coating

Cleveland

Cleveland C55248 Straight Flute Hand Tap 7/8"-9 UNC Bottoming 4 Flutes

SKU CH-8FXA-SGD1T

Straight-flute hand tap cuts 7/8"-9 UNC threads in a bottoming style with four flutes and TiN-coated high-speed steel

  • TypeTaps
  • Cuts internal threads in through-holes and blind holes with a 7/8"-9 UNC bottoming tap
  • High-speed steel construction resists wear during repeated hand-tapping operations
  • TiN coating reduces friction and extends tool life in steel and alloy workpieces
  • Four-flute design improves chip evacuation and thread accuracy
  • H4 thread limit and 2B class of fit deliver consistent, precision threads

Thread-Cutting Tap for 7/8"-9 UNC Holes

The Cleveland C55248 is a straight-flute hand tap made from High Speed Steel with a TiN coating. It cuts right-hand UNC threads to a 2B class of fit and carries an H4 thread limit. The tool is designed for general-purpose threading in through or blind holes where a bottoming chamfer is required.

Verify Hole Size and Material Compatibility

Before ordering, confirm the drilled hole matches the 75 percent thread drill size of 19.50 mm. Ensure the workpiece material is suitable for a High Speed Steel tap and that the application can accommodate a bottoming chamfer with a thread length of 2 7/32 in. The tap requires a standard tap wrench or holder for manual operation.

Four-Flute Design Aids Chip Evacuation in Blind

The four-flute configuration provides additional chip space compared to fewer-flute taps, helping to clear swarf when threading to the bottom of a hole. The TiN coating reduces friction and extends tool life in steel and similar alloys. The overall length of 4 11/16 in allows reach into moderately deep bores while remaining manageable by hand.

Highlights

  • Cuts internal threads in through-holes and blind holes with a 7/8"-9 UNC bottoming tap
  • High-speed steel construction resists wear during repeated hand-tapping operations
  • TiN coating reduces friction and extends tool life in steel and alloy workpieces
  • Four-flute design improves chip evacuation and thread accuracy
  • H4 thread limit and 2B class of fit deliver consistent, precision threads

Specifications

BrandCLEVELAND
TypeTaps

Questions about this item

Does the C55248 tap come with the 19.50 mm drill bit needed for the 75 percent thread, or must I buy it separately?

The tap is sold by itself; the 19.50 mm drill bit for the 75 percent thread is not included and must be purchased separately.

How do I decide between a bottoming tap and another style for my 7/8"-9 UNC job?

Choose the bottoming style when you need to cut threads close to the bottom of a blind hole; other styles are better for through holes or starting threads.

What does the H4 thread limit mean for the fit of the finished 7/8"-9 UNC threads?

H4 places the pitch diameter toward the upper side of the 2B class, giving a tighter fit that still meets the 2B tolerance for general-purpose assemblies.

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